ABSTRACT
This paper presents the results of experimental research on the critical loading of two-chord steel columns laced in a single plane. Eight semi-technical scale physical models were constructed for the purposes of experimental testing, modelled on railway traction columns. Loading was focused at the level of the head and applied to an eccentric in the lacing plane. The goal of experimental testing was to determine the pathways to static equilibrium between the longitudinal force on the eccentric, and the bending angle of the cross-section at half the column height and its head displacement. The models were tested to structural failure. The forms of structural failure were observed in relation to flexural-torsional buckling of the column, as well as local buckling of the lacings. Critical forces of flexural-torsional buckling were determined using the Southwell method. The physical models were also analyzed numerically with the ABAQUS program using solid finite elements. Practice-oriented conclusions are presented.
